/*
 * Copyright IBM Corp. and others 2017
 *
 * This program and the accompanying materials are made available under
 * the terms of the Eclipse Public License 2.0 which accompanies this
 * distribution and is available at https://www.eclipse.org/legal/epl-2.0/
 * or the Apache License, Version 2.0 which accompanies this distribution and
 * is available at https://www.apache.org/licenses/LICENSE-2.0.
 *
 * This Source Code may also be made available under the following
 * Secondary Licenses when the conditions for such availability set
 * forth in the Eclipse Public License, v. 2.0 are satisfied: GNU
 * General Public License, version 2 with the GNU Classpath
 * Exception [1] and GNU General Public License, version 2 with the
 * OpenJDK Assembly Exception [2].
 *
 * [1] https://www.gnu.org/software/classpath/license.html
 * [2] https://openjdk.org/legal/assembly-exception.html
 *
 * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0-only WITH Classpath-exception-2.0 OR GPL-2.0-only WITH OpenJDK-assembly-exception-1.0
 */
package com.ibm.oti.VMCPTool;

public class Util {

	public static String transformFlag(String oldFlag) {
		if (oldFlag.startsWith("!")) {
			// remove starting !
			oldFlag = oldFlag.substring(1);
		}
		if (!oldFlag.startsWith("J9VM_")) {
			return oldFlag;
		}

		// hack some special cases in
		if (oldFlag.equals("J9VM_IVE_JXE_OERELOCATOR")) {
			return "ive_jxeOERelocator";
		}

		String newFlag = oldFlag.substring(5); // trim off the J9VM_
		int pos = newFlag.indexOf('_') + 1;
		String flag = newFlag.substring(0, pos).toLowerCase();
		boolean makeUpper = false;
		while (true) {
			int last = pos;
			pos = newFlag.indexOf('_', last);
			if (pos < 0) {
				if (last >= newFlag.length()) {
					break;
				} else {
					pos = newFlag.length();
				}
			}
			if (makeUpper) {
				flag += newFlag.substring(last, ++last).toUpperCase();
			} else {
				makeUpper = true;
			}
			flag += newFlag.substring(last, pos).toLowerCase();
			pos += 1;
		}
		return flag;
	}

}
